/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package joran.newRule;
import joran.calculator.ComputationAction2;
import org.apache.joran.Interpreter;
import org.apache.joran.Pattern;
import org.apache.joran.RuleStore;
import org.apache.joran.action.NewRuleAction;
import org.apache.joran.helper.SimpleRuleStore;
import java.util.List;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
/**
* This example illustrates the usage of NewRuleAction which allows the Joran
* interpreter to learn new rules on the fly from the XML file being
* interpreted.
*
* This example relies heavily on the code from the joran.calculator package.
*
* @author Ceki Güulcü
*/
public class NewRuleCalculator {
public static void main(String[] args) throws Exception {
// Uncomment the following line in order to enable log statements generated
// from joran itself.
// org.apache.log4j.BasicConfigurator.configure();
// As usual, we create a simple rule store.
RuleStore ruleStore = new SimpleRuleStore();
// we start with the rule for the top-most (root) element
ruleStore.addRule(new Pattern("*/computation"), new ComputationAction2());
// Associate "/new-rule" pattern with NewRuleAction from the
// org.apache.joran.action package.
//
// We will let the XML file to teach the Joran interpreter about new rules
ruleStore.addRule(
new Pattern("/computation/new-rule"), new NewRuleAction());
// Create a new Joran Interpreter and hand it our simple rule store.
Interpreter ji = new Interpreter(ruleStore);
// Create a SAX parser
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser saxParser = spf.newSAXParser();
// Parse the file given as the application's first argument and
// set the SAX ContentHandler to the Joran Interpreter we just created.
saxParser.parse(args[0], ji);
// The file has been parsed and interpreted. We now print any errors that
// might have occured.
List errorList = ji.getExecutionContext().getErrorList();
if (errorList.size() > 0) {
System.out.println("The following errors occured:");
for (int i = 0; i < errorList.size(); i++) {
System.out.println("\t" + errorList.get(i));
}
}
}
}